/Engine/Plugins/Runtime/MassEntity/Source/MassEntity/Public/MassEntityManager.h
A version of CreateEntity that's creating a number of entities (Count) in one go
a creation context that will notify all the interested observers about newly created fragments once the context is released
[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FEntityCreationContext](API\Plugins\MassEntity\FMassEntityManager\FEntityCreationContext) > BatchCreateEntities ( const [FMassArchetypeHandle](API\Plugins\MassEntity\FMassArchetypeHandle) & ArchetypeHandle, const int32 Count, [TArray](API\Runtime\Core\Containers\TArray)< [FMassEntityHandle](API\Plugins\MassEntity\FMassEntityHandle) > & OutEntities )